Citation: Ruan Wen-Juan, Zhu Zhi-Ang, Huang Xiao-Qun, Chen Rong-Ti, Jiang Dong-Qing. Kinetic Study on Porphinatoiron(III) Catalyzing Decomposition of β-Carotene[J]. Acta Physico-Chimica Sinica, 1994, 10(04): 312-318. doi: 10.3866/PKU.WHXB19940406
铁(III)卟啉催化β-胡萝卜素分解动力学研究
使用BeckmannDU-8B紫外可见分光光度计研究了以氯合四－间三甲苯基卟啉铁（Ⅲ）（FeTMPCl）为催化剂，间氯过氧化苯甲酸（mCPBA）为氧化剂，咪唑（I_m）、2－甲基咪唑（MeI_m）、2－乙基－4－甲基咪唑（EMI_m）为轴向配体，催化β-胡萝卜素（β－cte）氧化分解为维生素A的动力学规律，提出了反应机理，研究了温度、催化剂浓度、氧化剂浓度及轴向配体对反应速率的影响，应用Gauss－Newton－Marquardt方法求得各基元反应的有关动力学参数．
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关键词:
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氯合四-间三甲苯基卟啉铁(III)
- / 氧化分解
- / 反应机理
- / β-胡萝卜素
English
Kinetic Study on Porphinatoiron(III) Catalyzing Decomposition of β-Carotene
A spectrophotometric study of the kinetics of β-carotene oxidative decom-position to vitamin A is reported in this paper. Meso-tetramesityl-porphinatoiron (Ⅲ) chloride (FeTMPCl) was used as catalyst and m-chloroper-benzoic acid (mCPBA) as oxidant in dichloromethane. The reaction mechanism was postulated. The experimental data were simu lated with IBM-PC computer. The kinetic parameters of the elementary steps were obtained. The activation enthalpy △~≠H_m and activation entropy △~≠S_m and standard molar enthalpy change ΔH_m and standard molar entropy change ΔS_m of the elementary steps were calculted. The effect of various ligands on the rate of reaction was also examined.
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